QwtPlotPanner Class Reference

#include <qwt_plot_panner.h>

Inherits QwtPanner.

List of all members.

Signals
void	moved (int dx, int dy)
void	panned (int dx, int dy)
Public Member Functions
QwtPlotCanvas *	canvas ()
const QwtPlotCanvas *	canvas () const
const QCursor	cursor () const
virtual bool	eventFilter (QObject *, QEvent *)
void	getAbortKey (int &key, int &state) const
void	getMouseButton (int &button, int &buttonState) const
bool	isAxisEnabled (int axis) const
bool	isEnabled () const
bool	isOrientationEnabled (Qt::Orientation) const
Qt::Orientations	orientations () const
QwtPlot *	plot ()
const QwtPlot *	plot () const
	QwtPlotPanner (QwtPlotCanvas *)
void	setAbortKey (int key, int state=Qt::NoButton)
void	setAxisEnabled (int axis, bool on)
void	setCursor (const QCursor &)
void	setEnabled (bool)
void	setMouseButton (int button, int buttonState=Qt::NoButton)
void	setOrientations (Qt::Orientations)
virtual	~QwtPlotPanner ()
Protected Slots
virtual void	moveCanvas (int dx, int dy)
Protected Member Functions
virtual QBitmap	contentsMask () const
virtual QPixmap	grab () const
virtual void	paintEvent (QPaintEvent *)
virtual void	widgetKeyPressEvent (QKeyEvent *)
virtual void	widgetKeyReleaseEvent (QKeyEvent *)
virtual void	widgetMouseMoveEvent (QMouseEvent *)
virtual void	widgetMousePressEvent (QMouseEvent *)
virtual void	widgetMouseReleaseEvent (QMouseEvent *)

---

Detailed Description

QwtPlotPanner provides panning of a plot canvas.

QwtPlotPanner is a panner for a QwtPlotCanvas, that adjusts the scales of the axes after dropping the canvas on its new position.

Together with QwtPlotZoomer and QwtPlotMagnifier powerful ways of navigating on a QwtPlot widget can be implemented easily.

Note:

The axes are not updated, while dragging the canvas

See also:

QwtPlotZoomer, QwtPlotMagnifier

---

Constructor & Destructor Documentation

QwtPlotPanner::QwtPlotPanner

(

QwtPlotCanvas *

canvas

)

[explicit]

Create a plot panner.

The panner is enabled for all axes

Parameters:

canvas

Plot canvas to pan, also the parent object

See also:

setAxisEnabled()

QwtPlotPanner::~QwtPlotPanner

(

)

[virtual]

Destructor.

---

Member Function Documentation

QwtPlotCanvas * QwtPlotPanner::canvas

(

)

Return observed plot canvas.

const QwtPlotCanvas * QwtPlotPanner::canvas

(

)

const

Return Observed plot canvas.

QBitmap QwtPlotPanner::contentsMask

(

)

const [protected, virtual]

Calculate a mask from the border mask of the canvas

See also:

QwtPlotCanvas::borderMask()

Reimplemented from QwtPanner.

const QCursor QwtPanner::cursor

(

)

const [inherited]

Returns:

Cursor that is active while panning

See also:

setCursor()

bool QwtPanner::eventFilter	(	QObject *	object,
		QEvent *	event
	)		[virtual, inherited]

Event filter.

When isEnabled() the mouse events of the observed widget are filtered.

Parameters:

object	Object to be filtered
event	Event

See also:

widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseMoveEvent()

void QwtPanner::getAbortKey	(	int &	key,
		int &	state
	)		const [inherited]

Get the abort key.

void QwtPanner::getMouseButton	(	int &	button,
		int &	buttonState
	)		const [inherited]

Get the mouse button.

QPixmap QwtPanner::grab

(

)

const [protected, virtual, inherited]

Grab the widget into a pixmap.

bool QwtPlotPanner::isAxisEnabled

(

int

axis

)

const

Test if an axis is enabled

Parameters:

axis	Axis, see QwtPlot::Axis

Returns:

True, if the axis is enabled

See also:

setAxisEnabled(), moveCanvas()

bool QwtPanner::isEnabled

(

)

const [inherited]

Returns:

true when enabled, false otherwise

See also:

setEnabled, eventFilter()

bool QwtPanner::isOrientationEnabled

(

Qt::Orientation

o

)

const [inherited]

Return true if a orientatio is enabled

See also:

orientations(), setOrientations()

void QwtPlotPanner::moveCanvas	(	int	dx,
		int	dy
	)		[protected, virtual, slot]

Adjust the enabled axes according to dx/dy

Parameters:

dx	Pixel offset in x direction
dy	Pixel offset in y direction

See also:

QwtPanner::panned()

void QwtPanner::moved	(	int	dx,
		int	dy
	)		[signal, inherited]

Signal emitted, while the widget moved, but panning is not finished.

Parameters:

dx	Offset in horizontal direction
dy	Offset in vertical direction

Qt::Orientations QwtPanner::orientations

(

)

const [inherited]

Return the orientation, where paning is enabled.

void QwtPanner::paintEvent

(

QPaintEvent *

pe

)

[protected, virtual, inherited]

Paint event.

Repaint the grabbed pixmap on its current position and fill the empty spaces by the background of the parent widget.

Parameters:

pe	Paint event

void QwtPanner::panned	(	int	dx,
		int	dy
	)		[signal, inherited]

Signal emitted, when panning is done

Parameters:

dx	Offset in horizontal direction
dy	Offset in vertical direction

QwtPlot * QwtPlotPanner::plot

(

)

Return plot widget, containing the observed plot canvas.

const QwtPlot * QwtPlotPanner::plot

(

)

const

Return plot widget, containing the observed plot canvas.

void QwtPanner::setAbortKey	(	int	key,
		int	state = Qt::NoButton
	)		[inherited]

Change the abort key The defaults are Qt::Key_Escape and Qt::NoButton

Parameters:

key	Key ( See Qt::Keycode )
state	State

void QwtPlotPanner::setAxisEnabled	(	int	axis,
		bool	on
	)

En/Disable an axis.

Axes that are enabled will be synchronized to the result of panning. All other axes will remain unchanged.

Parameters:

axis	Axis, see QwtPlot::Axis
on	On/Off

See also:

isAxisEnabled(), moveCanvas()

void QwtPanner::setCursor

(

const QCursor &

cursor

)

[inherited]

Change the cursor, that is active while panning The default is the cursor of the parent widget.

Parameters:

cursor

New cursor

See also:

setCursor()

void QwtPanner::setEnabled

(

bool

on

)

[inherited]

En/disable the panner.

When enabled is true an event filter is installed for the observed widget, otherwise the event filter is removed.

Parameters:

on	true or false

See also:

isEnabled(), eventFilter()

void QwtPanner::setMouseButton	(	int	button,
		int	buttonState = Qt::NoButton
	)		[inherited]

Change the mouse button The defaults are Qt::LeftButton and Qt::NoButton

void QwtPanner::setOrientations

(

Qt::Orientations

o

)

[inherited]

Set the orientations, where panning is enabled The default value is in both directions: Qt::Horizontal | Qt::Vertical

/param o Orientation

void QwtPanner::widgetKeyPressEvent

(

QKeyEvent *

keyEvent

)

[protected, virtual, inherited]

Handle a key press event for the observed widget.

Parameters:

keyEvent

Key event

See also:

eventFilter(), widgetKeyReleaseEvent()

void QwtPanner::widgetKeyReleaseEvent

(

QKeyEvent *

keyEvent

)

[protected, virtual, inherited]

Handle a key release event for the observed widget.

Parameters:

keyEvent

Key event

See also:

eventFilter(), widgetKeyReleaseEvent()

void QwtPanner::widgetMouseMoveEvent

(

QMouseEvent *

mouseEvent

)

[protected, virtual, inherited]

Handle a mouse move event for the observed widget.

Parameters:

mouseEvent

Mouse event

See also:

eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent()

void QwtPanner::widgetMousePressEvent

(

QMouseEvent *

mouseEvent

)

[protected, virtual, inherited]

Handle a mouse press event for the observed widget.

Parameters:

mouseEvent

Mouse event

See also:

eventFilter(), widgetMouseReleaseEvent(), widgetMouseMoveEvent(),

void QwtPanner::widgetMouseReleaseEvent

(

QMouseEvent *

mouseEvent

)

[protected, virtual, inherited]

Handle a mouse release event for the observed widget.

Parameters:

mouseEvent

Mouse event

See also:

eventFilter(), widgetMousePressEvent(), widgetMouseMoveEvent(),